Hi Mario,
The issue may be that the stylesheets that the XML reports use are located in different places on the target machine, for example due to path changes based on the operating system. Even if you include the stylesheet, the reports will still look for it in a specific TestStand location. You can use the XML packaging utility to package the XML file and all required stylesheets and images into a single directory. The tool will fix all paths to the dependent files as well, so the report will always load correctly. The utility is here:
<TestStand>\Bin\XMLPack.exe
Al B.
Staff Software Engineer - TestStand
CTA/CLD